EP0060212B1 - Tray drying chamber - Google Patents

Tray drying chamber Download PDF

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Publication number
EP0060212B1
EP0060212B1 EP82730022A EP82730022A EP0060212B1 EP 0060212 B1 EP0060212 B1 EP 0060212B1 EP 82730022 A EP82730022 A EP 82730022A EP 82730022 A EP82730022 A EP 82730022A EP 0060212 B1 EP0060212 B1 EP 0060212B1
Authority
EP
European Patent Office
Prior art keywords
tray
drying chamber
truck
drying
chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP82730022A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0060212A1 (en
Inventor
Dietrich Meissner
Heinz Geisenhof
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayer Pharma AG
Original Assignee
Schering AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Schering AG filed Critical Schering AG
Publication of EP0060212A1 publication Critical patent/EP0060212A1/en
Application granted granted Critical
Publication of EP0060212B1 publication Critical patent/EP0060212B1/en
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
    • F26B9/06—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers
    • F26B9/066—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards in stationary drums or chambers the products to be dried being disposed on one or more containers, which may have at least partly gas-previous walls, e.g. trays or shelves in a stack

Definitions

  • This invention relates to a drying installation for thermal drying.
  • a drying apparatus consisting of a drying chamber and a tray-truck positioned within the drying chamber has been described in FR-A--2,311,637.
  • This apparatus is constructed for drying wood, wherein a ventilator is placed at the rear of the drying chamber in a way that the impeller projects into the opening of the rear side of the tray-truck which has a rectangular form, whereas the drying chamber has a cylindrical shape.
  • a drying device for drying a web of cloth on a heated rotating drum has been described in FR-A-2,355,258.
  • tray-type drying chambers with recirculated air are frequently employed.
  • the moist material is typically spread on specially shaped plates, so-called trays, which in turn are stacked on racks.
  • the racks in most cases include casters or other rolling means on the bottom, so that the term tray-trucks is commonly employed to describe this structure.
  • the tray-truck filled with trays is normally exposed within the tray drying chamber to an air stream which has been heated in a separate heating register.
  • the warm air stream is conducted in a manner such that the largest portion thereof, i.e. in the range of 70-80 %, is recirculated, and the remaining, i.e.
  • the residual moisture content of the moist material to be dried also includes organic chemical solvents, instead of just water, then these solvents can be condensed in a separate condenser within the drying chamber, while the drying of the material is being conducted, in order to protect the environment.
  • organic chemical solvents instead of just water
  • these solvents can be condensed in a separate condenser within the drying chamber, while the drying of the material is being conducted, in order to protect the environment.
  • loose particles of the material to be dried are usually, in part, entrained in dust form, preferably adhering to the moist condenser in the chamber.
  • the drying chamber of the invention is comprised primarily of two functionally unitary parts. More specifically, these two parts are the drying chamber proper, illustrated in Figure 1, and the tray-truck, illustrated in Figure 2.
  • the structure of the two parts are so functionally related that only when the tray-truck is positioned within the drying chamber proper, are the gas-conducting channels defined to establish the specific gaseous flow paths which are necessary to conduct the drying process properly and/or for the conducting the gas therethrough.
  • the tray-truck and the drying chamber fit flush together.
  • the fitting is within the tolerance of manufacturing, practically, 1 to 5 mm.
  • the clearance between the tray truck and the walls of the drying chamber effects a stray gaseous stream of 5 to 20 %. This deviation must be compensated by an augmented amount of gas passing over the moist material.
  • Optimal drying is achieved at a gas flow of 0.1 to 2 m/s.
  • the drying chamber is of a construction such that all walls, including the roof 3 and the floor 4, can be independently temperature-controlled.
  • the drying chamber is constructed in a way such that the rear wall 5, and the two sidewalls 6 and 7 can be temperature-controlled.
  • the walls are made of double-jacketed sheet metal, preferably stainless steel, through which the coolant, such as cooling water or cooling brine and/or the heating medium, such as hot water or steam, is conducted.
  • suitable materials include steel sheet, provided with an organic protective coating, such as varnish or "Teflon".
  • the tray-truck with casters or wheels is made up of closed side parts 13, a floor 11, and a roof 10.
  • a rear wall 8 serves for regulating the direction of flow of the gaseous stream, and can be shaped as either one of a slotted wall, a finned wall, or a perforated wall.
  • the rear wall 8 functions effectively as a control plate and will be referred to hereinafter as such.
  • Baffle 9 is located spaced a predetermined distance behind the control plate 8, and the baffle is tightly sealed with respect to the roof but open toward the floor 11.
  • the tray plates 12 are supported in the tray-truck on guiding angle members attached to the sidewalls 13 of the tray-truck. This means for supporting the tray plates is not shown and is conventional in nature. Other support structures can also be used as will become obvious to the skilled artisan.
  • an inert gas such as nitrogen, is first of all introduced through a sealable feeding nipple to create an inert atmosphere in the chamber 14 for obvious safety reasons.
  • a fan 15 with a vertically arranged shaft is located with the drive wheel 16 thereof integrally secured to the roof 3 of the drying chamber.
  • the fan 15 serves to drive the gaseous stream along the heated rear wall 5 of the drying chamber, and the gaseous stream is heated as a result of this contact.
  • the heated gas then rises through the space defined between the baffle 9 and the control plate 8 and is conducted through the control plate 8 and between the stacks of the tray plates 12, during which procedure the gas becomes saturated with the organic solvent which has been vaporized as a result of contact with the heated gas.
  • the gas then passes the zone between the door of the drying chamber and the front end of the tray-truck, as shown in Figure 3, and the gas flows over the roof 10 of the tray-truck and below the roof 3 of the chamber past the drive wheel 16. After passing downstream of the drive wheel 16, and still upstream of the rear wall 5, a portion of the gaseous stream is branched off and conducted to the cooled sidewalls 6 and 7.
  • the partial gas stream is diverted from the main stream behind the fan 15 by means of flaps, one for each wall 6 and 7, at an amount of 5 to 10 %.
  • the gas is cooled on the side walls to a temperature below the dew point of the gas stream, and the solvent is condensed thereon.
  • the temperature control of the side walls is effected in accordance with the particular solvent present, and as can be seen, is conventional in nature.
  • the condensate is then collected on the lower portions of the sidewalls 6 and 7, which are shaped so as to collect the liquid, and from there it is drained off by means of discharge outlets 29 and 31.
  • the drying chamber of this invention can, of course, also be utilized for the drying of water- moist products with no organic solvents, in which case the drying step can be carried out with fresh air rather than an inert gas, and in this case the air is exhausted, after being circulated, through the sealable exhaust air nipple 17 by way of the roof.
  • the chamber be maintained totally sealed with respect to escaping gas because fresh air is plentiful and inexpensive to supply, whereas with an inert atmosphere, conservation of the inert gas containing gaseous organic solvents is desired.
  • the drying chamber When working with an inert atmosphere, the drying chamber is under pressure in the range of 10- 3 to 2 x 10- 2 at.
  • top wall 3 and rear wall 5, and optionally the front door (not shown) and the floor are associated with conduits extending to the double wall section thereof through which a hot fluid, such as steam, is supplied thereto by means of inlet 21, and removed by means of outlet 23.
  • a hot fluid such as steam
  • the sidewalls 6 and 7 are cooled by a supply of cooling fluid such as cold water by means of inlet 25 and outlet 27.
  • the drying chamber of this invention has the advantage that, as compared to the prior art devices of comparable drying capacity, it is relatively small in size because auxiliary accessories, such as heating and/or cooling registers with the associated gas-conducting conduits are not required. Furthermore, all areas inside the chamber are readily accessible by simply moving the tray-truck out of the chamber, and thus, can be easily cleaned.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)
EP82730022A 1981-03-09 1982-03-05 Tray drying chamber Expired EP0060212B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19813109458 DE3109458A1 (de) 1981-03-09 1981-03-09 Hordentrockenschrank
DE3109458 1981-03-09

Publications (2)

Publication Number Publication Date
EP0060212A1 EP0060212A1 (en) 1982-09-15
EP0060212B1 true EP0060212B1 (en) 1986-02-19

Family

ID=6127031

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82730022A Expired EP0060212B1 (en) 1981-03-09 1982-03-05 Tray drying chamber

Country Status (6)

Country Link
US (1) US4459763A (enrdf_load_stackoverflow)
EP (1) EP0060212B1 (enrdf_load_stackoverflow)
JP (1) JPS57202478A (enrdf_load_stackoverflow)
BR (1) BR8201232A (enrdf_load_stackoverflow)
DE (2) DE3109458A1 (enrdf_load_stackoverflow)
DK (1) DK157258C (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0266516A3 (de) * 1986-11-05 1989-03-29 Hermann Waldner GmbH & Co. Trockner, insbesondere für die chemische Industrie
EP0775882A1 (de) 1995-11-21 1997-05-28 Hermann Waldner GmbH & Co. Trockner, insbesondere für die chemische oder pharmazeutische Industrie

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8318604D0 (en) * 1983-07-08 1983-08-10 Newsome Air Conditioning Cooling apparatus
US5173316A (en) * 1989-03-03 1992-12-22 Heycott William B Method for preparing fish bait
US5003143A (en) * 1990-04-09 1991-03-26 Progressive Recovery, Inc. Microwave sludge drying apparatus and method
US5191722A (en) * 1992-06-22 1993-03-09 Her Majesty The Queen In Right Of Canada, As Represented By The Province Of Ontario Method and arrangement for drying of fire hoses
AU1153597A (en) * 1996-10-23 1998-05-15 Marvin Feldman Karpa Air circulating cigar humidor
US5878508A (en) * 1997-01-10 1999-03-09 American Harvest, Inc. Food dehydrator
CN2749501Y (zh) * 2004-11-18 2006-01-04 黄明光 抽拉式多功能循环消毒柜
CN106705595A (zh) * 2017-03-14 2017-05-24 苏州聚晶科技有限公司 一种温控烘干机

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2899189A (en) * 1959-08-11 Apparatus for processing compressed fuel
US1282822A (en) * 1915-11-10 1918-10-29 Gordon Don Harris Tunnel-drier.
CH127092A (de) * 1927-08-05 1928-08-01 Alois Schilter Zu Wärm- und Kühlzwecken verwendbarer Schrank.
US2921382A (en) * 1957-10-23 1960-01-19 Louis L Blum Shrimp preparing machine
IT1032926B (it) * 1975-05-19 1979-06-20 Pagnozzi Ernesto Guglielmo Procedimento a vuoto per essiccare legname massiccio particolarmente per essiccare legname delicato e o facilmente collassabile
DE7618897U1 (de) * 1976-06-15 1976-12-09 Boewe Boehler & Weber Kg Maschinenfabrik, 8900 Augsburg Trommeltrockner mit einer in einem gehaeuse um eine achse rotierbare trommel
JPS5436367Y2 (enrdf_load_stackoverflow) * 1976-10-23 1979-11-02
JPS5624389Y2 (enrdf_load_stackoverflow) * 1978-02-23 1981-06-08

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0266516A3 (de) * 1986-11-05 1989-03-29 Hermann Waldner GmbH & Co. Trockner, insbesondere für die chemische Industrie
US4837945A (en) * 1986-11-05 1989-06-13 Hermann Waldner Gmbh & Co. Dryer, particularly for the chemical industry
EP0775882A1 (de) 1995-11-21 1997-05-28 Hermann Waldner GmbH & Co. Trockner, insbesondere für die chemische oder pharmazeutische Industrie

Also Published As

Publication number Publication date
JPS57202478A (en) 1982-12-11
EP0060212A1 (en) 1982-09-15
JPH0221516B2 (enrdf_load_stackoverflow) 1990-05-15
DK157258C (da) 1990-04-30
DE3109458A1 (de) 1982-09-23
DE3269117D1 (en) 1986-03-27
DK157258B (da) 1989-11-27
DK83182A (da) 1982-09-10
BR8201232A (pt) 1983-01-18
US4459763A (en) 1984-07-17

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